Patent US4760205A successfully refreshed from Google Patents.
Patent US4977485A successfully refreshed from Google Patents.
US4977485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic ceramic capacitor
Assignee: Murata Manufacturing Co Ltd
•
Filing: 1989-07-10
•
Granted: 1990-12-11
•
Expires: 2009-07-10
Abstract
Abstract A monolithic ceramic capacitor which comprises a laminate composed of a plurality of dielectric ceramic layers and internal electrode layers provided between said dielectric ceramic layers, and external electrodes provided at both ends of said laminate and electrically connected to said internal electrode layers, said dielectric ceramic layer being a dielectric ceramic containing lead oxide and a reduction inhibitor and said internal electrode layer being copper or a copper alloy.
Inventors
- 👤 Yoshiaki Mori
- 👤 Hiroshi Takagi
- 👤 Yukio Sakabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:37
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/018; H01G4/06; H01G4/08; H01G4/12; H01G4/1209; H01G4/1254; B; B32; B32B; B32B18/00; C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497; C04B35/499; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6567; C04B2235/658; C04B2235/6582; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/50; C04B2237/66; C04B2237/68
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
126 words
A monolithic ceramic capacitor which comprises a laminate composed of a plurality of dielectric ceramic layers and internal electrode layers provided between said dielectric ceramic layers, and external electrodes provided at both ends of said laminate and electrically connected to said internal electrode layers, said dielectric ceramic layer being a dielectric ceramic containing lead oxide and a reduction inhibitor and said internal electrode layer being copper or a copper alloy and, wherein the reduction inhibitor is a material having the composition represented by the general formula: d(MnO.sub.2 +RO)+(1-d)(B.sub.2 O.sub.3 +SiO.sub.2) e(ZnO+RO+(1-e)(B.sub.2 O.sub.3 +SiO.sub.2), or aLi.sub.2 O+bRO+cB.sub.2 O.sub.3 +(1-a-b-c)SiO.sub.2 wherein RO is at least one component selected from the group consisting of MgO, CaO, SrO and BaO, and a, b, c, d and e are constants, respectively.
Claim 2
Dependent Claim
126 words
A monolithic ceramic capacitor which comprises a laminate composed of a plurality of dielectric ceramic layers and internal electrode layers provided between said dielectric ceramic layers, and external electrodes provided at both ends of said laminate and electrically connected to said internal electrode layers, said dielectric ceramic layer being a dielectric ceramic containing lead oxide and a reduction inhibitor and said internal electrode layer being copper or a copper alloy and, wherein the reduction inhibitor is a material having the composition represented by the general formula: d(MnO.sub.2 +RO)+(1-d)(B.sub.2 O.sub.3 +SiO.sub.2) e(ZnO+RO+(1-e)(B.sub.2 O.sub.3 +SiO.sub.2), or aLi.sub.2 O+bRO+cB.sub.2 O.sub.3 +(1-a-b-c)SiO.sub.2 wherein RO is at least one component selected from the group consisting of MgO, CaO, SrO and BaO, and a, b, c, d and e are constants, respectively.
Claim 3
Dependent Claim
22 words
A monolithic ceramic capacitor according to claim 1, wherein the internal electrode is copper or a copper alloy which contains glass frit.
Claim 4
Dependent Claim
26 words
A monolithic ceramic capacitor according to claim 1, wherein the internal electrode is copper or a copper alloy which contains the dielectric powder and/or reduction inhibitor.
Claim 5
Dependent Claim
31 words
A monolithic ceramic capacitor according to claim 1, wherein the reduction inhibitor is present in an amount of 0.05 to 5% by weight based on the weight of the dielectric ceramic.
Claim 6
Dependent Claim
43 words
A monolithic ceramic capacitor according to claim 4, wherein the dielectric ceramic containing lead oxide is represented by the formula aPb(Mg 1/3 Nb 170 )O 3 -bPb(zn 1/3 Nb 2/3 ) O 3 -cPbTIO 3 wherein a, b and c are constants, respectively.
References Cited (Backward Citations)
FR1171284A
Cited
US4101952A
Cited
US4353153A
Cited
FR2535313A1
Cited
US4451869A
Cited
EP0159869A2
Cited
US4700266A
Cited
US4701827A
Cited
EP0238241A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |